When shopping for a Digital Slr Camera habitancy often overlook or skimp on the camera's lenses. Camera Lenses serve as the digital Slr cameras "eye," the lens determines what and how your camera will see your branch and how well that view is transmitted to the camera's sensor chip for recording. The way I like to look at camera lenses is as painter's brushes, broad strokes, medium stokes, all purpose brushes, and small detail brushes. There is a lot to learn about digital slr camera lenses and this record will serve as a basic form to understanding them. The following sections by comparison the basic types of digital Slr camera lenses, how they work, and how to adopt them.
Focal Length
On a digital Slr camera the focal length of the lenses measures the length in the middle of the lens and the image sensor, measured in millimeters. Lenses can be classified into subgroups like prime, macro, wide angle, normal, telephoto, and zoom lenses. They are also rated in regards to f-stop or speed an example would be a F2.0 50mm lens or a 1.4F 80mm lens. We will by comparison this later in this article.
Prime Lenses:
Prime lenses are fixed focal length lenses like a 50mm 1.4f lens. To zoom with these types of lenses you need to use your feet and to get closer or farther away from the subject. Traditionally prime lenses are sharper and faster then zoom lenses. If you are on a funds you can pick up some remarkable used older prime lenses off eBay or your local camera store.
Macro Lenses:
Macro Lenses are your detail brushes they enable you to get up close and personal with your subject. These types of lenses are used for extreme close ups on small objects like daisies, pennies, and food but not little to these types of subjects. Examples of macro lenses are 50mm and 100mm macros. These lenses are also great for selective focus types of photos.
Wide-angle Lenses:
Wide-angle lenses are your broad stroke brushes; these types of lenses have short focal lengths. The short focal length has the visual succeed of "pushing" the branch away from you and development it appear smaller. The attractiveness of wide-angle lenses is you can be relatively close to your branch and fit a broad stroke of the background into the scene.
One qoute with wide-angle lenses is known as convergence, a distortion that makes vertical structures appear to lean toward the center of the frame. A way to check if the wide-angle lenses you are concerned in has convergence is to take test pictures before buying the lens. With high quality wide angles lenses like Canon L series lenses address this convergence issue well. Examples of wide-angle lenses are 15Mm, 17mm, 24mm and 28mm lenses.
Normal Lenses:
Normal Lenses try to mimic how the human eye sees and are some of the most versatile lenses you can use. These are my all purpose brushes, and are somewhere in the middle of a wide angle and a telephoto lenses. If you buy just one lens try and buy the fastest general lenses you can like a 50mm 1.4f lenses. Some examples of general lenses are 35mm; 50mm, 65mm and some consider a 80mm a general lens.
Telephoto Lenses:
Lenses with long focal lengths 100mm and higher are called telephoto lenses. A long focal length seems to bring the branch closer to you and increases the subject's size in the frame. Telephoto lenses also give your subjects a visible look and flatten out your subject. These lenses are my short stroke brushes.
Zoom Lenses:
Zoom lenses are extra because they can be very versatile. These types of lenses vary in their focal lengths and come in many in wide-angle, telephoto, and wide-angle to telephoto. In my bag I carry a 17mm to 35mm my wide-angle broad brush, 24mm to 70mm my medium brush, and a 80mm to 200mm my short brush. With these three lenses I get a very board range of focal lengths for any situation. All of my zooms are at least f2.8 straight through out the lenses range, which means my f-stop can stay constant while I am zooming in and out. These types of lenses are very costly but so get what you pay for. When shopping for a zoom lenses check out the f-stop range rating. An example is a 24mm to 300mm f3.5-f5.6 lenses meaning the bottom f-stop you can shoot is at the 24mm range of the lenses and when you zoom to 200mm the bottom you can go is f5.6. Zoom lenses can give you flexibility and versatility all in one lenses. When buying a zoom lens try and get one that is made of glass and is the fastest you can afford, you will not regret it.
Understanding what these different groups of lenses can do will help you make more informed decisions on what lenses to purchase and what to put in your camera bag.
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